Gotta admit it ... that’s pretty clever and well executed.
My guess is that some random person created the fake seal as a meme many months ago, it ended up on google images, and when this event came about, a young AV team graphic designer for this event did a search for a U.S. Seal and found this fake one, not really knowing how it should look, and grabbed it. Dumb but understandable, in these editor-free days.
Some audio visual person with TDS was able to get that image up there. They were probably trolling the President and had a good laugh momentarily, but unless they’re trying to get a job in Hollywood, that was a costly career mistake.